Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e745c37e6387fb…

MALICIOUS

PDF

29.6 KB Created: 2020-10-28 23:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46fa04a023d715819b7f219eed99e8e SHA-1: 580c019f0c9f950dcf1892427c28138fe8470ede SHA-256: f3e745c37e6387fba3eab4d130deb29bb0bf55c94d674016fbe0df9e328871bc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link farm. One prominent URL, 'https://ttraff.com/pify?keyword=extraordinary+measures+video+worksheet+answers', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be generated by wkhtmltopdf, suggesting a programmatic creation for link distribution. The presence of many external PDF links further supports the SEO link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=extraordinary+measures+video+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4408321/normal_5f94a0fde0e38.pdf
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5f95781f1ab1c.pdf
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/3711696.pdf
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f8c3d74cf04a.pdf
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f90d12932985.pdf
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f927e1580349.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5f920a6e21f52.pdf
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f88655999866.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/3770932.pdf
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/napuzo.pdf
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5f98a1e52cac5.pdf
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5f8aabed766a9.pdf
    • https://wimejevufafej.weebly.com/uploads/1/3/4/3/134379448/depilurumuvonit.pdf
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f92008bd69cc.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f88af7ca88be.pdf
    • https://cdn-cms.f-static.net/uploads/4408589/normal_5f9268c32f287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0478/2627/2415/files/shutterfly_upload_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0493/1030/2367/files/fury_warrior_bfa_guide_pve.pdf
    • https://cdn.shopify.com/s/files/1/0502/8410/1804/files/pugosalitupepig.pdf
    • https://cdn.shopify.com/s/files/1/0497/3766/2615/files/teaching_feeling_apk_android_2.0.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005efa.bin
7d835210fdf488aa639145e274e59208774421a8d743e6762d3552633deaebd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 5260 bytes